The extension of the E-Hero cards is similar to how the Silent Swordsman series was laid out. Maybe some of the super fusions supports could have been released closer to the original release of Burstinatrix, Avian, and the others. Maybe some of the Fusions could have been released as Promo cards in Shonen Jump, or a video game. But the point is moot now. It is also focusing on the negative.
I would love to see Fish become a stand alone type, as well as the others mentioned. But I am still heartened to see that the trend that was started back in the days of Pharonic Guardian, is starting to pick up.
Gravekeepers: all in one set
Amazoness: missing only one, which came later as a promo
Archfiends: all in one set, with a splash card here and there. (also helped to support some faltering earlier releases, like
Summoned Skull,
Lesser Fiend,
Beast of Talwar, B.Skull Dragon, and
Fiend Skull Dragon)
Agents: All in one expansion
Horus and Armed Dragon: All in one expansion
Dark Realm: All in one expansion
Mystic Swordsman, Silent Swordsman, Ultimate Insect, Elemental Heros: all examples of support for a theme that is closely spaced between expansions.
TLM=Rocks;FET=Beasts;CRV=Machine; Pharonic Guardian=Zombies;Magician's Force=Spellcaster; IOC=RFP support*: very closely aligned support cards.
*it seems unfair to judge an entire set by its abberations. Sure it had the Chaos Twins, but it also brought us
Chaos Necromancer, Gren Maju De Eiza,
Chaosrider Gustaph, and a whole bunch more.
If we really want to complain about the continuous support over and over again of cards, why not complain about the Ojama set. We've been getting cards from that since way back in IOC.

They are still making more AND it still isn't being played! Talk about beating a dead horse.